// Copyright 2024 Flant JSC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package config

import (
	"encoding/json"
	"fmt"

	"github.com/go-openapi/spec"
	"sigs.k8s.io/yaml"
)

func validateExtensions(data json.RawMessage, schema spec.Schema) error {
	if schema.Properties == nil {
		return nil
	}

	var properties map[string]json.RawMessage

	err := yaml.Unmarshal(data, &properties)
	if err != nil {
		return err
	}

	err = validateXRulesExtensions(data, schema)
	if err != nil {
		return err
	}

	for field, fieldSchema := range schema.Properties {
		err = validateXRulesExtensions(properties[field], fieldSchema)
		if err != nil {
			return fmt.Errorf("%s: %w", field, err)
		}

		err = validateExtensions(properties[field], fieldSchema)
		if err != nil {
			return fmt.Errorf("%s: %w", field, err)
		}
	}

	return nil
}

func validateXRulesExtensions(data json.RawMessage, schema spec.Schema) error {
	if xRules, ok := schema.Extensions.GetStringSlice(xRulesExtension); ok {
		for _, rule := range xRules {
			xValidator, ok := xRulesValidators[rule]
			if !ok {
				continue
			}

			err := xValidator(data)
			if err != nil {
				return err
			}
		}
	}
	if schema.SchemaProps.Items != nil && schema.SchemaProps.Items.Schema != nil {
		if xRules, ok := schema.SchemaProps.Items.Schema.Extensions.GetStringSlice(xRulesExtension); ok {
			for _, rule := range xRules {
				xValidator, ok := xRulesValidators[rule]
				if !ok {
					continue
				}

				// avoid validation exception by validation empty data
				if len(data) == 0 {
					return nil
				}

				var items []json.RawMessage
				err := json.Unmarshal(data, &items)
				if err != nil {
					return err
				}

				for _, item := range items {
					err = xValidator(item)
					if err != nil {
						return err
					}
				}
			}
		}
	}

	return nil
}
